HTML and CSS Reference
In-Depth Information
Table 3-8.
(
continued
)
Attribute
Element(s)
Description
Value
pattern
input
Pattern to be matched by the value
of the form control
Regular expression matching
the JavaScript pattern
production
placeholder
input
,
textarea
Visible label placed within the
form control
Text
poster
video
Poster frame displayed prior to
video playback
URL
preload
audio
,
video
none
|
metadata
|
auto
Buffering hint for media
readonly
input
,
textarea
Determines whether the value is
editable
Boolean attribute
rel
a
,
area
,
link
Relationship between the
document containing the
hyperlink and the destination
resource
Set of space-separated tokens
required
input
,
select
,
textarea
Determines whether the control is
required for form submission
Boolean attribute
reversed
ol
List with reversed numbering
Boolean attribute
rows
textarea
Number of lines to show
Non-negative integer greater
than zero
rowspan
td
,
th
Number of rows that the cell is to
span
Non-negative integer
sandbox
iframe
Security rules for nested content
Unordered set of unique
space-separated tokens
consisting of allow-same-
origin, allow-forms, and
allow-scripts (ASCII case-
insensitive)
spellcheck
true
|
false
HTML elements
Specifies the need for spelling and
grammar check
scope
th
row
|
col
|
rowgroup
|
colgroup
Specifies header cell scope
selected
option
Option selected by default
Boolean attribute
shape
area
circle
|
default
|
poly
|
rect
Shape type in an image map
size
input
,
select
Control size
Non-negative integer greater
than zero
sizes
link
Icon size for
rel="icon"
Unordered set of unique
space-separated tokens
(ASCII case-insensitive)
(
continued
)
Search WWH ::
Custom Search